Codeine is an opioid medication prescribed to reduce physical pain. It can cause feelings of relaxation, drowsiness, confusion, nausea, itchiness and constipation, especially if taken in large doses. So what happened? If you mixed metronidazole and alcohol, did you observe anything unusual? Easy-to-read patient leaflet for Promethazine and Codeine. Includes indications, proper use, special instructions, precautions, and possible side effects. I realize this was posted 3+ years ago, but there needs to be another voice here. Tylenol by itself, look at taking 2 extra strength Tylenols, twice a day, not too much damage there, in fact probably not much if a lot of water is consumed. Glutethimide was a hypnotic sedative that was introduced by Ciba in 1954 as a safe alternative to barbiturates to treat insomnia. Before long, however, it had become clear that glutethimide was just as likely to cause addiction and caused similarly withdrawal symptoms. Dao de qiaokeli (Credit: Erik S. Peterson) We like science as much as the next guy, but historically, it hasn't been the most consistent when it comes to telling us what we should and shouldn't eat. Compare prices, print coupons and get savings tips for Fioricet With Codeine (Butalbital / Acetaminophen / Caffeine / Codeine) and other Tension Headache drugs at CVS, Walgreens, and other pharmacies. Prices start at $33.95 Acetaminophen/codeine (Tylenol With Codeine) is an inexpensive drug used to treat mild to moderate pain. This drug is less popular than comparable drugs. Can you have an allergy to codeine/ morphine and not dilaudid, and please explain why. - Answered by a verified Doctor Hi I am new to this.Just a note that I also was put onto Tramadol,as I have had a chronic back injury for 12yrs and wanted something stronger than panadole forte, I was not getting much relief.I then moved and changed doctors.